filter

Abstract

The utility model discloses a filter, including casing, apron, tuning rod and resonance rod, apron with casing is connected and encloses the inner chamber, apron is provided with the screw hole of internal thread, tuning rod includes the body and is located the plastic piece of body outer circumferential side, the part of body is provided with plastic piece and can move and is arranged in screw hole, resonance rod sets up in the inner chamber. The filter provided by the utility model can reduce the generation of chippings through the screwing cooperation of the part of body provided with the plastic piece and the screw hole of apron in the debugging process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a filter belongs to radio frequency product technical field. BACKGROUND

[0002] The radio frequency index of the filter needs to be debugged to meet the requirements, specifically by changing the distance between the metal screw rod and the resonant rod, the frequency of the single cavity is changed to meet the corresponding index.

[0003] During the debugging process, the threads of the metal screw rod, the cover plate and the nut three metal parts rub, which produces metal wires, metal dust and other debris. These debris are brought into the functional cavity through the threads, which can easily cause short circuit between the screw rod and the resonant rod, or cause intermodulation failure. The cover needs to be disassembled and cleaned, and after cleaning, the debugging needs to be performed again. During the debugging process, metal wires and metal dust are produced, resulting in high production cost and low pass rate. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a filter capable of reducing the generation of debris.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A filter, comprising:

[0007] A shell;

[0008] A cover plate connected with the shell and surrounding an inner cavity, the cover plate is provided with a threaded hole with internal threads;

[0009] A tuning rod, the tuning rod comprises a body and a plastic part arranged on the outer circumferential side of the body, and the part of the body provided with the plastic part can be movably arranged in the threaded hole; and

[0010] A resonant rod arranged in the inner cavity.

[0011] As a further improved technical scheme of the utility model, the filter comprises a shell, the cover plate is connected with the shell,

[0012] The body comprises a rod part and a tail part connected with the rod part, the tail part is arranged in the inner cavity and faces the resonant rod, and the plastic part at least wraps one end of the rod part close to the tail part.

[0013] As a further improved technical scheme of the utility model, the rod part is provided with a clamping groove, and the plastic part is at least partially arranged in the clamping groove.

[0014] As a further improved technical scheme of the present utility model, the rod part includes a groove part connected with the tail part and a head part connected with the groove part, the clamping groove is formed in the groove part, and the filter includes a nut connected with the head part.

[0015] As a further improved technical scheme of the present utility model, the plastic part is injection molded in the clamping groove, the head part is provided with an external thread matched with the nut, and the external diameter of the plastic part is equal to the external diameter of the head part.

[0016] As a further improved technical scheme of the present utility model, the head part is provided with a limiting part at one end away from the tail part.

[0017] As a further improved technical scheme of the present utility model, the plastic part wraps the head part.

[0018] As a further improved technical scheme of the present utility model, the external diameter of the tail part is greater than the external diameter of the plastic part.

[0019] As a further improved technical scheme of the present utility model, the plastic part is provided with an external thread, or the peripheral surface of the plastic part is a smooth surface.

[0020] As a further improved technical scheme of the present utility model, the end surface of the tail part towards the resonant rod is a spherical surface or a plane.

[0021] Compared with the prior art, the filter provided by the present utility model has the beneficial effects that: in the filter, the tuning rod includes a main body and a plastic part, the plastic part is arranged on the peripheral side of the main body, and in the debugging process, the part of the main body provided with the plastic part is matched with the screw hole of the cover plate, so that the generation of debris is reduced, the risk of short circuit and intermodulation failure is reduced, and the qualified rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the first embodiment of the filter of the present utility model;

[0023] Figure 2 is Figure 1 an exploded view of the filter shown in the figure;

[0024] Figure 3 is Figure 1 a longitudinal sectional view of the filter shown in the figure;

[0025] Figure 4 is Figure 3 a sectional view of the tuning rod in the figure;

[0026] Figure 5 is Figure 2 a perspective view of the main body of the tuning rod in the figure;

[0027] Figure 6 is a disassembled schematic view of a second embodiment of the filter of the present application;

[0028] Figure 7 is Figure 6 a longitudinal sectional view of the tuning rod in the second embodiment of the filter of the present application;

[0029] Figure 8 is a disassembled schematic view of a third embodiment of the filter of the present application;

[0030] Figure 9 is Figure 8 a longitudinal sectional view of the tuning rod in the third embodiment of the filter of the present application;

[0031] Figure 10 is a disassembled schematic view of a fourth embodiment of the filter of the present application;

[0032] Figure 11 is Figure 10 a perspective view of the tuning rod in the fourth embodiment of the filter of the present application;

[0033] Figure 12 is Figure 11 a disassembled schematic view of the tuning rod shown in FIG. 8;

[0034] Figure 13 is Figure 11 a longitudinal sectional view of the tuning rod shown in FIG. 9. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. If there are several embodiments, the features of the embodiments can be combined with each other when there is no conflict. When the description refers to the drawings, the same numbers on different drawings represent the same or similar elements unless otherwise specified. The description of the exemplary embodiments described in the following exemplary embodiments does not represent all embodiments consistent with the present application; rather, they are merely examples of devices, products and / or methods consistent with some aspects of the present application as recited in the claims of the present application.

[0036] The terms used in the present application are used only for the purpose of describing the exemplary embodiments, and are not intended to limit the scope of the present application. The singular forms "a," "an," and "the" used in the specification and claims of the present application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should be understood that the use of terms such as "first", "second" and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but are merely used to distinguish features. Similarly, the use of terms such as "one" or "a" does not denote a quantity limitation, but rather indicates the presence of at least one. Unless otherwise indicated, the terms "front", "back", "up", "down", and similar terms in the present application are used for convenience only and are not intended to be limiting to a particular position or spatial orientation. The terms "include" or "comprise" and similar terms are open-ended terms that are intended to mean that the elements listed after the terms are present in the item or items being described, but that other elements can also be present as well. In the present application, the term "several" means two or more.

[0038] The present application provides four kinds of filter, for example Figures 1 to 5 The first embodiment is shown in the schematic diagram, for example Figure 6 And Figure 7 The second embodiment is shown in the schematic diagram, for example Figure 8 And 9 The third embodiment is shown in the schematic diagram, for example Figures 10 to 13 The fourth embodiment is shown in the schematic diagram.

[0039] Please refer to Figures 1 to 13 It is shown that the filter includes a shell, a tuning rod 3, a nut 4 and a resonant rod 5, the shell has an inner cavity 120, the resonant rod 5 is arranged in the inner cavity 120, the tuning rod 3 is at least partially located in the inner cavity 120, and the nut 4 is connected with the part of the tuning rod 3 located outside the inner cavity 120; along the height direction of the filter, the tuning rod 3 and the resonant rod 5 are arranged in an up-down manner, and by adjusting the position of the tuning rod 3, the distance between the tuning rod 3 and the resonant rod 5 can be changed, the frequency of the single cavity is changed, and the corresponding radio frequency index is met.

[0040] Referring to Figures 1 to 3 , Figure 6 , Figure 8 And Figure 10 The shell includes a shell body 1 and a cover plate 2 connected with the shell body 1, one end of the shell body 1 is closed, the other end of the shell body 1 has an opening, the cover plate 2 is arranged on the opening end of the shell body 1 and forms the inner cavity 120 together with the shell body 1. Specifically, the cover plate 2 is made of metal, the cover plate 2 is provided with a threaded hole 21, and the tuning rod 3 is movably arranged in the threaded hole 21.

[0041] As Figure 3 , Figure 6 , Figure 8 And Figure 10As shown, the tuning rod 3 comprises a body 31 and a plastic piece 32 arranged on the outer circumferential side of the body 31, the body 31 is made of metal material, the part of the body 31 provided with the plastic piece 32 can be movably arranged in the threaded hole 21. Since the strength of the plastic is less than the strength of the metal material adopted by the cover plate 2, during the debugging process, the plastic piece 32 and the cover plate 2 hardly generate metal wire, metal dust and other debris, reducing the risk of short circuit and intermodulation distortion, and improving the pass rate.

[0042] Referring to Figure 4 , Figure 7 , Figure 9 and Figure 11 , the body 31 comprises a rod portion 311 and a tail portion 312 connected with the rod portion 311, the tail portion 312 is arranged in the inner cavity 120 surrounded by the cover plate 2 and the shell 1 and faces the resonant rod 5, and the plastic piece 32 at least wraps one end of the rod portion 311 close to the tail portion 312. During the assembly and adjustment of the tuning rod 3 and the cover plate 2, the tail portion 312 does not screw with the threaded hole 21 of the cover plate 2, and will not generate metal wire, metal dust and other debris. Since the plastic piece 32 at least wraps one end of the rod portion 311 close to the tail portion 312, the plastic piece 32 can enter the inner cavity 120, thereby reducing the metal debris falling into the inner cavity 120.

[0043] As shown in Figure 5 , Figure 7 , Figure 9 and Figure 13 , the rod portion 311 comprises a groove portion 3111 connected with the tail portion 312 and a head portion 3112 connected with the groove portion 3111, a clamping groove 3110 is formed in the groove portion 3111, and the plastic piece 32 is at least partially arranged in the clamping groove 3110, wherein the nut 4 is directly or indirectly connected with the head portion 3112.

[0044] As shown in Figure 4 , Figure 7 and Figure 9 , the plastic piece 32 is injection molded in the clamping groove 3110, the plastic piece 32 does not wrap the head portion 3112, the head portion 3112 is provided with an external thread matched with the nut 4, and the nut 4 is directly connected with the head portion 3112. During the adjustment of the resonant rod 5, the plastic piece 32 can enter the inner cavity 120, the head portion 3112 is located at the upper end of the plastic piece 32, the head portion 3112 extends into or does not extend into the inner cavity 120, and the metal debris generated by the head portion 3112 and the cover plate 2 can be received by the upper end of the plastic piece 32. Metal debris rarely or does not enter the inner cavity 120.

[0045] As shown in Figure 13 , the plastic piece 32 is injection molded in the clamping groove 3110 and the outer circumferential side of the head portion 3112, the nut 4 is indirectly connected with the head portion 3112 by wrapping the entire rod portion 311 with the plastic piece 32, and the rod portion 311 does not contact the cover plate 2 and will not generate metal debris.

[0046] Referring to Figure 5 , the groove part 3111 is provided with an anti-rotation part 3114, which plays a limiting role in the injection mold, as shown in the figure. Specifically, when the body 31 of the tuning rod 3 is processed, an injection groove for injection of plastic is reserved, which is an annular clamping groove 3110, and a flat surface is provided on the annular groove wall of the clamping groove 3110, which serves as the anti-rotation part 3114 to play an anti-rotation function. In addition, not only the body 31 of the tuning rod 3 in the first embodiment is provided with the anti-rotation part 3114, but also the body 31 of the tuning rod 3 in the second, third and fourth embodiments can be provided with the anti-rotation part 3114.

[0047] As shown in Figure 4 and Figure 7 , the head part 3112 is provided with a limiting part 3113 at the end away from the tail part 312, which is a disc structure with an outer diameter greater than that of the head part 3112. In this way, the head part 3112 cannot extend into the inner cavity 120, and metal debris generated by the head part 3112 and the cover plate 2 cannot enter the inner cavity 120. In the assembly process, the tuning rod 3 is first assembled with the nut 4, and then the tuning rod 3 is assembled into the cover plate 2. After assembly is completed, the distance between the tuning rod 3 and the tuning rod 5 changes with the screwing of the tuning rod 3 and the cover plate 2, thereby realizing frequency adjustment.

[0048] In the third and fourth embodiments, the rod part 311 cancels the limiting part, increases the height of the clamping groove 3110, and increases the length of the plastic part 32 wrapping the rod part 311, so that the inner thread of the cover plate 2 is always in contact with the plastic part 32 of the tuning rod 3, and the diameter of the tail part 312 of the tuning rod 3 can be locally increased to increase the adjustment range.

[0049] As shown in Figure 8 and Figure 11 , the outer diameter of the tail part 312 is greater than that of the plastic part 32. By increasing the outer diameter of the tail part 312, the adjustment range is increased. In the assembly process, the tuning rod 3 is first assembled with the cover plate 2, and then the nut 4 is connected with the tuning rod 3, and then the cover plate 2 is connected with the shell 1. As shown in Figure 9 , the outer diameter of the plastic part 32 is equal to that of the head part 3112, and the outer diameter of the tail part 312 is also greater than that of the head part 3112, or, as shown in Figure 13 , the plastic part 32 wraps the head part 3112.

[0050] The end face 3121 of the tail part 312 facing the tuning rod 5 is a spherical surface to adapt to the concave tuning rod 5, for example Figure 7 . Alternatively, the end face 3121 of the tail part 312 facing the tuning rod 5 is a flat surface to adapt to the case where the tuning rod 5 is flat, for example Figure 5 ,Figure 9 and Figure 13 as shown.

[0051] The plastic piece 32 is provided with external threads, or the outer circumferential surface of the plastic piece 32 is a smooth surface, that is, a surface without external threads.

[0052] In the filter, the plastic piece 32 is arranged on the outer circumferential side of the body 31. During debugging, the part of the body 31 provided with the plastic piece 32 is matched with the threaded hole 21 of the cover plate 2, so that the generation of debris is reduced, the risk of short circuit and intermodulation failure is reduced, and the qualified rate is improved.

[0053] The filter has a simple structure, and the material cost is increased slightly, and meanwhile, the debugging mode is not affected.

[0054] The above embodiments are only used to illustrate the present application and not to limit the technical solutions described in the present application. The understanding of the present application should be based on the skilled in the art. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A filter, characterized by, The filter comprises: a housing (1); a cover plate (2) connected with the housing (1) and enclosing an inner cavity (120), the cover plate (2) being provided with a threaded hole (21) having internal threads; a tuning rod (3) comprising a body (31) and a plastic member (32) provided on the outer circumferential side of the body (31), the body (31) being movably provided in the threaded hole (21) with the part of the body (31) provided with the plastic member (32); and a resonant rod (5) provided in the inner cavity (120).

2. The filter of claim 1, wherein, The body (31) comprises a rod portion (311) and a tail portion (312) connected with the rod portion (311), the tail portion (312) being provided in the inner cavity (120) and facing the resonant rod (5), and the plastic member (32) at least wrapping the rod portion (311) near one end of the tail portion (312).

3. The filter of claim 2, wherein, The rod portion (311) is provided with a clamping groove (3110), and the plastic member (32) is at least partially provided in the clamping groove (3110).

4. The filter of claim 3, wherein, The rod portion (311) comprises a slot portion (3111) connected with the tail portion (312) and a head portion (3112) connected with the slot portion (3111), and the clamping groove (3110) is formed in the slot portion (3111), and the filter comprises a nut (4) connected with the head portion (3112).

5. The filter of claim 4, wherein, The plastic member (32) is injection molded in the clamping groove (3110), the head portion (3112) is provided with external threads matched with the nut (4), and the outer diameter of the plastic member (32) is equal to the outer diameter of the head portion (3112).

6. The filter of claim 5, wherein, The head portion (3112) is provided with a limiting portion (3113) at one end away from the tail portion (312).

7. The filter of claim 4, wherein, The plastic member (32) wraps the head portion (3112).

8. The filter of claim 5 or 7, wherein, The outer diameter of the tail portion (312) is greater than the outer diameter of the plastic member (32).

9. The filter of claim 1, wherein, The plastic member (32) is provided with external threads, or the outer circumferential surface of the plastic member (32) is smooth.

10. The filter of claim 2, wherein, The end surface (3121) of the tail portion (312) facing the resonant rod (5) is a spherical surface or a flat surface.

Images